Extract dimensions from an image and scale them to 1:20. Given wall and door dimensions, calculate lintel dimensions.

To solve this problem, we need to extract all relevant dimensions from the provided image and technical information, then scale them to 1:20.

Given Dimensions:

• Wall thickness = $25 \text{cm} = 250 \text{mm}$
• Wall height = $2.70 \text{m} = 2700 \text{mm}$
• Door width = $90 \text{cm} = 900 \text{mm}$
• Door height = $2.10 \text{m} = 2100 \text{mm}$
• Lintel height (main body) = $40 \text{mm}$
• Lintel projection (